Maintenance of Substations

Recently, the demand for electric power is growing faster than the growth of supply capacity. Under such circumstances, it is becoming difficult for the substations, which used to go through periodical inspections several times a year under power cut condition, to stop supplying the power, and inspection under normal operating condition is necessary. Terminals and connecting sections of each equipment in the substations generate heat due to the growing electric resistance by degradation. Because TVS can see those heat generating sections safely from a distance during normal operation, it is widely used in maintenance of transformer facilities.

Primary side transformer facility and measuring points by TVS
Fig.1: Primary side transformer facility and measuring points by TVS.
Example of abnormally heated LS
Photo1 and 2: Example of abnormally heated LS.
Thermal image (using TVS-2300MkII ST)
Photo3 and 4: Example of abnormality detection by simultaneous comparison of three phases.
  • *TVS-100 was used.

Measuring points

Fig. 1 is an example of primary side transformer facility, and (1) through (25) in the figure are the measuring points by TVS. High voltage current of 500KV is brought from the outer left of the figure by a transmission line, converted to 200KV by the transformer on the outer right of the figure, and sent out by transmission line via secondary side equipment located in symmetry to this figure. (PD: Potential Device, LS: Line Switch, CB: Circuit Breaker)

Example of abnormality detection

Photos 1 and 2 are the examples of abnormally heated LS. And, Photos 3 and 4 are the examples of abnormality detection by simultaneous comparison of three phases.

Abnormality criteria

ln addition to the limit of temperature rise and maximum allowable temperature of each equipment, the following criteria are used in combination.

  • Difference from the outside temperature; 20℃ or more.
  • Difference between equipment arranged in series; 10℃ or more.
  • Difference between equipment of same type; 5℃ or more.

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